CN104333249A - Seven-level inverter circuit and control method thereof, multi-phase inverter and frequency converter - Google Patents
Seven-level inverter circuit and control method thereof, multi-phase inverter and frequency converter Download PDFInfo
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Abstract
The invention relates to the technical field of frequency converters, in particular to a seven-level inverter circuit and a control method thereof, a multi-phase inverter and a frequency converter. The seven-level inverter circuit comprises capacitors C1-C4 and power electronic switches S1-S12, wherein output of seven levels is realized through opening and closing of the power electronic switches. Compared with the seven-level inverter circuit in a related technology, the seven-level inverter circuit has the advantages that a small number of components are used, the components are normal and readily available and the connection structure is simple, so that the topological structure of the seven-level inverter circuit is simplified and the cost of the seven-level inverter circuit is reduced. Since the topological structure of the seven-level topological circuit is simplified in the embodiment of the invention, the cost of the seven-level inverter circuit is reduced; thus the topological structures of the multi-phase inverter and the frequency converter including a plurality of seven-level inverter circuits are simple and the cost is reduced.
Description
Technical field
The present invention relates to converter technology field, in particular to a kind of seven level inverter circuits and control method, polyphase inverter and frequency converter.
Background technology
Frequency converter (Variable-frequency Drive, VFD) is application converter technique and microelectric technique, controls the electric control appliance of alternating current motor by changing machine operation supply frequency mode.Frequency converter is primarily of the composition such as rectification (AC-DC), filtering, inversion (direct current becomes interchange), brake unit, driver element, detecting unit microprocessing unit.As a kind of basic electric equipment, obtain and applied comparatively widely.
Frequency converter (containing inverter, lower same) is divided into voltage-source type and current source type two class.The frequency converter of voltage-source type, according to every level quantity that can export mutually, is divided into 2 level, 3 level, 5 level and more level, is wherein referred to as multi-level frequency conversion device more than the frequency converter of 2 level.
When single power electronic device proof voltage level is limited, more level means higher voltage fan-out capability, and output voltage has better waveform, lower harmonic wave, and this is also the major significance that level quantity increases.
Voltage-source type multi-level frequency conversion device is divided into common DC bus structure and transformer isolation structure two class, the former each output phase general DC busbar, and structure is comparatively succinct, but needs comparatively advanced circuit topology can produce the output of more level; The latter provides mutually isolated power supply by the mutually isolated winding of transformer, then realize many level by the voltage superposition between inverter circuit corresponding to different winding to export, this frequency converter needs comparatively complicated transformer, cost and volume are all higher, and different frequency converter cannot be realized see shared rectification circuit and/or braking circuit, system cost is higher.
In correlation technique, in the frequency converter of common DC bus structure, every inverter topology that can export 7 or more level quantity is mutually all too complicated, thus in real product, does not have practical application.
Such as, as Fig. 1 shows a kind of diode-clamped seven level inverter circuit structure, this kind of structure is proposed by German scholar the earliest, by the conducting off state of control switch device, realize the clamp to switching device voltage by diode, realize the output of 7 level.This kind of structure needs too much diode, complex structure, cost and volume higher, and extremely complicated to the control of capacitor voltage equalizing.
Again such as, Fig. 2 shows a kind of capacitor-clamped type seven level inverter circuit structure, and this kind of structure is proposed by French scholar the earliest, by the voltage control of every layer capacitance and gating, realizes the output of 7 level.This kind of structure needs too much electric capacity, and in figure, the withstand voltage and capacity of each electric capacity is different, and volume is excessive, high cost.
To sum up can find out, the frequency converter of the many level of existing common DC bus, the topological structure reaching 7 level is too complicated, cost and volume too high, practicality is lower.
Summary of the invention
In view of this, the object of the embodiment of the present invention is to provide a kind of seven level inverter circuits and control method, polyphase inverter and frequency converter, to simplify the topological structure of seven level inverter circuits, reduces costs.
Embodiments provide a kind of seven level inverter circuits, comprising: be parallel to the electric capacity C1 between common DC bus positive pole and common DC bus neutral pole; Be parallel to the electric capacity C2 between common DC bus neutral pole and common DC bus negative pole; Be series at the electronic power switch S2 between common DC bus neutral pole and output stage, electronic power switch S5, electronic power switch S7 and electronic power switch S8 successively; Be series at the electronic power switch S3 between common DC bus neutral pole and output stage, electronic power switch S6, electronic power switch S9 and electronic power switch S10 successively; Be connected to the electronic power switch S1 between the series connection node of electronic power switch S2 and electronic power switch S5 and common DC bus positive pole; Be connected to the electronic power switch S4 between the series connection node of electronic power switch S3 and electronic power switch S6 and common DC bus negative pole; Be series at the electric capacity C3 between the series connection node of electronic power switch S5 and electronic power switch S7 and the series connection node of electronic power switch S6 and electronic power switch S9 and electric capacity C4 successively; Be connected to the electronic power switch S11 between the series connection node of electronic power switch S7 and electronic power switch S8 and the series connection node of electric capacity C3 and electric capacity C4; Be connected to the electronic power switch S12 between the series connection node of electronic power switch S9 and electronic power switch S10 and the series connection node of electric capacity C3 and electric capacity C4.
Preferably, described electronic power switch S1 ~ electronic power switch S10 is inverse conductivity type turn-off device; Described electronic power switch S11 and described electronic power switch S12 is respectively diode.
Preferably, described electronic power switch S1 ~ electronic power switch S12 is inverse conductivity type turn-off device.
Preferably, power electronic device and diode can be turned off described comprising against conductivity type turn-off device; The described power electronic device that turns off comprises emitter and collector electrode; Described emitter is connected with the anode of described diode, and described collector electrode is connected with the negative electrode of described diode; The described power electronic device that turns off is insulated gate bipolar transistor IGBT, integrated gate commutated thyristor IGCT, IEGT IEGT, bipolar junction transistor BJT or turn-off thyristor GTO.
Preferably, described electric capacity C1 is identical with the withstand voltage of described electric capacity C2; Described electric capacity C3 is identical with the withstand voltage of described electric capacity C4; The withstand voltage of described electric capacity C1 is 3 times of the withstand voltage of described electric capacity C3.
Preferably, the withstand voltage of described electronic power switch S1 ~ described electronic power switch S4 is identical; The withstand voltage of described electronic power switch S5 ~ described electronic power switch S12 is identical; The withstand voltage of described electronic power switch S1 is 3 times of the withstand voltage of described electronic power switch S5.
Preferably, described electronic power switch S1 ~ described electronic power switch S4 includes three sub-electronic power switches of connecting successively, and the withstand voltage of described sub-electronic power switch is identical with the withstand voltage of described electronic power switch S5.
The embodiment of the present invention additionally provides a kind of seven level inverter circuit control methods, comprising: by being turned on or off of the electronic power switch S1 ~ S12 in above-mentioned seven level inverter circuits of preset rules control, make output stage export seven kinds of different magnitudes of voltage.
The embodiment of the present invention additionally provides a kind of polyphase inverter, comprises multiple above-mentioned seven level inverter circuits; Multiple described seven level inverter circuits are in parallel in common DC bus side.
The embodiment of the present invention additionally provides a kind of frequency converter, comprising: rectification circuit and multiple above-mentioned seven level inverter circuits; The input of described rectification circuit is connected with electrical network, and output is connected with common DC bus; Multiple described seven level inverter circuits are parallel on described common DC bus.
Seven level inverter circuits that the embodiment of the present invention provides and control method thereof, comprise 4 capacitors and 12 electronic power switches at seven level inverter circuits, by disconnection, the closed output realizing seven level of electronic power switch.Compared with seven level inverter circuits in correlation technique, seven level inverter circuit of the present invention component number used reduces and components and parts are common is easy to get, syndeton is simple, thus simplifies the topological structure of seven level inverter circuits, reduces the cost of seven level inverter circuits.
In DC bus side, parallel connection forms polyphase inverter to multiple above-mentioned seven level inverter circuits in addition, in DC bus side, parallel connection forms three-phase inverter to such as three above-mentioned seven level inverter circuits, and rectification circuit and multiple above-mentioned seven level inverter circuits connect to form frequency converter; Because the topological structure simplifying seven level inverter circuits in the embodiment of the present invention reduces seven level inverter circuit costs, the polyphase inverter and the frequency converter topological structure that make to comprise multiple seven level inverter circuits are simple, and cost reduces.
For making above-mentioned purpose of the present invention, feature and advantage become apparent, preferred embodiment cited below particularly, and coordinate appended accompanying drawing, be described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, be to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore the restriction to scope should be counted as, for those of ordinary skill in the art, under the prerequisite not paying creative work, other relevant accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 shows the first topology diagram of seven level inverter circuits in correlation technique;
Fig. 2 shows the second topology diagram of seven level inverter circuits in correlation technique;
Fig. 3 shows the first topology diagram of seven level inverter circuits in the embodiment of the present invention;
Fig. 4 shows the second topology diagram of seven level inverter circuits in the embodiment of the present invention;
Fig. 5 shows the 3rd topology diagram of seven level inverter circuits in the embodiment of the present invention;
Fig. 6 shows the 4th kind of topology diagram of seven level inverter circuits in the embodiment of the present invention;
Fig. 7-Figure 13 respectively illustrates the different operating state of the embodiment of the present invention seven level inverter circuit;
Figure 14 shows the structural representation of multi-phase inverter circuit in the embodiment of the present invention;
Figure 15 shows the structural representation of frequency converter in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.The assembly of the embodiment of the present invention describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the claimed scope of the present invention of not intended to be limiting, but selected embodiment of the present invention is only represented.Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
In view of seven level inverter circuit complex structure costs in correlation technique are high, the present invention program utilizes 4 capacitors and 12 electronic power switches to devise a kind of seven level inverter circuits, by disconnection, the closed output realizing seven level of electronic power switch, simplify the topological structure of seven level inverter circuits, reduce the cost of seven level inverter circuits.
As shown in Figure 3, seven level inverter circuits of the embodiment of the present invention comprise: be parallel to the electric capacity C1 between common DC bus positive pole and common DC bus neutral pole; Be parallel to the electric capacity C2 between common DC bus neutral pole and common DC bus negative pole; Be series at the electronic power switch S2 between common DC bus neutral pole and output stage, electronic power switch S5, electronic power switch S7 and electronic power switch S8 successively; Be series at the electronic power switch S3 between common DC bus neutral pole and output stage, electronic power switch S6, electronic power switch S9 and electronic power switch S10 successively; Be connected to the electronic power switch S1 between the series connection node of electronic power switch S2 and electronic power switch S5 and common DC bus positive pole; Be connected to the electronic power switch S4 between the series connection node of electronic power switch S3 and electronic power switch S6 and common DC bus negative pole; Be series at the electric capacity C3 between the series connection node of electronic power switch S5 and electronic power switch S7 and the series connection node of electronic power switch S6 and electronic power switch S9 and electric capacity C4 successively; Be connected to the electronic power switch S11 between the series connection node of electronic power switch S7 and electronic power switch S8 and the series connection node of electric capacity C3 and electric capacity C4; Be connected to the electronic power switch S12 between the series connection node of electronic power switch S9 and electronic power switch S10 and the series connection node of electric capacity C3 and electric capacity C4.
Seven above-mentioned level inverter circuits, compared with seven level inverter circuits in correlation technique, decrease the usage quantity of components and parts, and components and parts are simple and easy to get, simplify the syndeton between components and parts, reduce the cost of seven level inverter circuits.In addition, seven level inverter circuits of the embodiment of the present invention can also significantly improve the voltage fan-out capability of frequency converter, improve output voltage waveforms, reduce harmonic wave of output voltage, reduce cost and the volume of frequency converter.
In Fig. 3, V+ represents common DC bus positive pole, and V-represents common DC bus negative pole, and Vn represents common DC bus neutral pole, and Vout represents this circuit output stage.
Seven above-mentioned level inverter circuits, different according to the components and parts selected, multiple implementation can be had, below with reference to accompanying drawing, preferred implementation is wherein described.
As shown in Figure 4, electronic power switch S1 ~ electronic power switch S12 is inverse conductivity type turn-off device.
Typical inverse conductivity type can turn off power electronic device and comprise the diode that can turn off power electronic device and reverse parallel connection, such as, when can to turn off power electronic device be insulated gate bipolar transistor IGBT, inverse conductivity type can turn off power electronic device and comprise diode and IGBT, the anode of diode is connected with the emitter of IGBT, and the negative electrode of diode is connected with the collector electrode of IGBT.
In addition, the turned off power electronic device in above-mentioned inverse conductivity type turn-off device can also be integrated gate commutated thyristor IGCT, IEGT IEGT, bipolar junction transistor BJT or turn-off thyristor GTO.
As shown in Figure 4, when the electronic power switch of said structure is connected to form seven level inverter circuits, in electronic power switch S2, the anode of diode is connected with common DC bus neutral pole, in electronic power switch S2, the negative electrode of diode is connected with the negative electrode of diode in electronic power switch S5, in electronic power switch S5, the anode of diode is connected with the negative electrode of diode in electronic power switch S7, in electronic power switch S7, the anode of diode is connected with the negative electrode of diode in electronic power switch S8, in electronic power switch S8, the anode of diode is connected with the output stage of circuit, the connected mode of electronic power switch S3, electronic power switch S6, electronic power switch S9 and electronic power switch S10 is identical with the connected mode of electronic power switch S2, electronic power switch S5, electronic power switch S7 and electronic power switch S9, repeats no more herein.
In Fig. 4, in electronic power switch S1, the negative electrode of diode is connected with common DC bus positive pole, and anode is connected with the series connection node of electronic power switch S2 and electronic power switch S5; In electronic power switch S4, the anode of diode is connected with common DC bus negative pole, and negative electrode is connected with the series connection node of electronic power switch S3 and electronic power switch S6;
In electronic power switch S11, the anode of diode is connected with the series connection node of electric capacity C3 and electric capacity C4, and negative electrode is connected with the series connection node of electronic power switch S7 and electronic power switch S8;
In electronic power switch S12, the negative electrode of diode is connected with the series connection node of electric capacity C3 and electric capacity C4, and anode is connected with the series connection node of electronic power switch S9 and electronic power switch S10.
Electronic power switch S1 ~ electronic power switch S12, can also as shown in Figure 5 except the implementation shown in Fig. 4, and electronic power switch S1 ~ electronic power switch S10 is inverse conductivity type turn-off device; Electronic power switch S11 and electronic power switch S12 is respectively diode.
In seven level inverter circuits shown in Fig. 5, the connected mode of electronic power switch S1 ~ electronic power switch S10 is identical with the connected mode of electronic power switch S1 ~ electronic power switch S10 in Fig. 4, repeats no more herein.
In seven level inverter circuits of Fig. 5, the anode of diode S11 is connected with the series connection node of electric capacity C3 and electric capacity C4, and negative electrode is connected with the series connection node of electronic power switch S7 and electronic power switch S8;
The negative electrode of diode S12 is connected with the series connection node of electric capacity C3 and electric capacity C4, and anode is connected with the series connection node of electronic power switch S9 and electronic power switch S10.
A kind of control method of above-mentioned seven level inverter circuits is provided in the embodiment of the present invention, specifically comprises: by being turned on or off of the electronic power switch S1 ~ S12 in above-mentioned seven level inverter circuits of preset rules control, make output stage export seven kinds of different magnitudes of voltage.
For making above-mentioned seven level inverter circuits export seven kinds of different magnitudes of voltage, type and the response parameter of capacitor and electronic power switch can be selected according to actual needs, and disconnect or conducting electronic power switch S1 ~ S12 according to certain rule.
For the optimum configurations of each electric capacity and each electronic power switch in seven level inverter circuits, below will enumerate preferred implementation and illustrate.
Seven level inverter circuits of the embodiment of the present invention, as shown in Figure 6, arrange electric capacity C1 identical with the withstand voltage of electric capacity C2; Electric capacity C3 is identical with the withstand voltage of electric capacity C4; The withstand voltage of electric capacity C1 is 3 times of the withstand voltage of electric capacity C3.Preferably, the withstand voltage of electronic power switch S1 ~ electronic power switch S4 is identical; The withstand voltage of electronic power switch S5 ~ electronic power switch S12 is identical; The withstand voltage of electronic power switch S1 is 3 times of the withstand voltage of electronic power switch S5.
When specific implementation, as shown in Figure 6, electronic power switch S1 ~ electronic power switch S4 includes three sub-electronic power switches of connecting successively, and the withstand voltage of sub-electronic power switch is identical with the withstand voltage of electronic power switch S5.
Show through too much group experiment, the capacitor utilizing above-mentioned parameter to arrange and electronic power switch are connected formation seven level inverter circuit, and relatively more simply, cost is cheaper, is the Economic realizing seven level inverter circuits for structure.
Below with reference to accompanying drawing, the control procedure of electronic power switch in above-mentioned seven level inverter circuits is illustrated.
During work, the voltage of C3, C4 is identical, is set to V1; The voltage of C1, C2 is identical, is 3*V1.By the on off state of each power electronic device of choose reasonable, Vout can be made to export 7 level, and main on off state is as shown in table 1, and in table 1,1 represents conducting, and 0 represents shutoff.
Table 1
In the control method of seven level inverter circuits, when electronic power switch maintenance the 1st, 2 kind of state, output stage output voltage is 0.Wherein, as shown in Figure 7, the first state is kept for electronic power switch, namely when electronic power switch S2, electronic power switch S5, electronic power switch S7, electron electric power switch S 8 close, when other electronic power switch disconnects, form path between common DC bus neutral pole, electronic power switch S2, electronic power switch S5, electronic power switch S7 and electronic power switch S8, the difference between output stage Vout and common DC bus neutral pole Vn is 0.
When electronic power switch keeps the 3rd, 4 and 5 kind of state, output stage output voltage is V1; As shown in Figure 8, the third state is kept for electronic power switch, namely when electronic power switch S1, electronic power switch S5, electronic power switch S9, electron electric power switch S 10 close, when other electronic power switch disconnects, path is formed between common DC bus neutral pole, electric capacity C1, electronic power switch S1, electronic power switch S5, electric capacity C3, electric capacity C4, electronic power switch S9 and electronic power switch S10, difference between output stage Vout and common DC bus neutral pole Vn is V1, and account form is:
Vout–Vn
＝V(C1)–V(C3)–V(C4)
＝3*V1–V1–V1
＝V1
When electronic power switch keeps the 6th, the 7th and the 8th kind of state, output stage output voltage is 2V1; As shown in Figure 9, the 6th kind of state is kept for electronic power switch, namely when electronic power switch S1, electronic power switch S5, electronic power switch S8, electron electric power switch S 11 close, when other electronic power switch disconnects, path is formed between common DC bus neutral pole, electric capacity C1, electronic power switch S1, electronic power switch S5, electric capacity C3, electronic power switch S11 and electronic power switch S8, difference between output stage Vout and common DC bus neutral pole Vn is 2V1, and account form is:
Vout–Vn
＝V(C1)–V(C3)
＝3*V1–V1
＝2*V1
When electronic power switch keeps the 9th kind of state, output stage output voltage is 3V1; As shown in Figure 10, when electronic power switch S1, electronic power switch S5, electronic power switch S7, electron electric power switch S 8 close, when other electronic power switch disconnects, path is formed between common DC bus neutral pole, electric capacity C1, electronic power switch S1, electronic power switch S5, electronic power switch S7 and electronic power switch S8, difference between output stage Vout and common DC bus neutral pole Vn is 3V1, and account form is:
Vout–Vn
＝V(C1)
＝3*V1
When electronic power switch keeps the 10th, the 11st and the 12nd kind of state, output stage output voltage is-V1; As shown in figure 11, the 10th kind of state is kept for electronic power switch, namely when electronic power switch S2, electronic power switch S5, electronic power switch S8, electron electric power switch S 11 close, when other electronic power switch disconnects, path is formed between common DC bus neutral pole, electronic power switch S2, electronic power switch S5, electric capacity C3, electronic power switch S11 and electronic power switch S8, difference between output stage Vout and common DC bus neutral pole Vn is-V1, and account form is:
Vout–Vn
＝–V(C3)
＝–V1
When electronic power switch keeps the 13rd, the 14th and the 15th kind of state, output stage output voltage is-2V1; As shown in figure 12, the 14th kind of state is kept for electronic power switch, namely when electronic power switch S4, electronic power switch S6, electronic power switch S8, electron electric power switch S 11 close, when other electronic power switch disconnects, path is formed between common DC bus neutral pole, electric capacity C2, electronic power switch S4, electronic power switch S6, electric capacity C4, electronic power switch S11 and electronic power switch S8, difference between output stage Vout and common DC bus neutral pole Vn is-2V1, and account form is:
Vout–Vn
＝–V(C2)+V(C4)
＝–3*V1+V1
＝–2*V1
When electronic power switch keeps the 16th kind of state, output stage output voltage is-3V1; As shown in figure 13, when electronic power switch S4, electronic power switch S6, electronic power switch S9, electron electric power switch S 10 close, when other electronic power switch disconnects, path is formed between common DC bus neutral pole, electric capacity C2, electronic power switch S4, electronic power switch S6, electronic power switch S9 and electronic power switch S10, difference between output stage Vout and common DC bus neutral pole Vn is-3V1, and account form is:
Vout–Vn
＝–V(C2)
＝–3*V1
In upper table, when S1, S2 are 0, conducting one of them, can not output voltage be had influence on, but the voltage that power electronic device bears can be had influence on.Similar situation also occurs in S3, S4, in S7, S8, S11, in S9, S10, S12.
Therefore when being no more than power electronic device voltage carrying capacity, can in certain above-mentioned group or some group conducting 1 switch, form new legal on off state.
This new on off state, is without impact for output, but the conversion between main switch state sometimes can be made more smooth-going, generally can be used in switch state process.
The present invention is intended to propose the frequency changer that a kind of every phase can reach 7 output levels, and its useful effect is the voltage fan-out capability that can significantly improve frequency converter, improves output voltage waveforms, reduces harmonic wave of output voltage, reduces cost and the volume of frequency converter.
A kind of polyphase inverter is additionally provided in the embodiment of the present invention, as shown in figure 14, it comprises multiple seven above-mentioned level inverter circuits, and multiple seven above-mentioned level inverter circuits are in parallel in common DC bus side, and the output stage of multiple above-mentioned seven level inverter circuits independently exports.Such as, when three above-mentioned seven level inverter circuits, in common DC bus side, parallel connection forms three-phase inverter.Because seven level inverter circuits of the embodiment of the present invention are relative to existing inverter circuit, topological structure is more simple, and cost is cheaper, and the polyphase inverter topological structure making to utilize this seven level inverter circuit multiple to form is simple, and cost reduces.
The embodiment of the present invention additionally provides a kind of frequency converter, and as shown in figure 15, it mainly comprises rectification circuit and multiple above-mentioned seven level inverter circuits; The input of rectification circuit is connected with electrical network, and output is connected with common DC bus; Multiple seven level inverter circuits are parallel on common DC bus, and the output stage of multiple seven level inverter circuits independently exports.Such as, when the quantity of seven level inverter circuits is three, form three phase converter.Because seven level inverter circuits of the embodiment of the present invention are relative to existing inverter circuit, topological structure is more simple, and cost is cheaper, and the frequency converter topological structure making to utilize this seven level inverter circuit multiple to form is simple, and cost reduces.
Above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (10)
1. seven level inverter circuits, is characterized in that, comprising:
Be parallel to the electric capacity C1 between common DC bus positive pole and common DC bus neutral pole;
Be parallel to the electric capacity C2 between common DC bus neutral pole and common DC bus negative pole;
Be series at the electronic power switch S2 between common DC bus neutral pole and output stage, electronic power switch S5, electronic power switch S7 and electronic power switch S8 successively;
Be series at the electronic power switch S3 between common DC bus neutral pole and output stage, electronic power switch S6, electronic power switch S9 and electronic power switch S10 successively;
Be connected to the electronic power switch S1 between the series connection node of electronic power switch S2 and electronic power switch S5 and common DC bus positive pole;
Be connected to the electronic power switch S4 between the series connection node of electronic power switch S3 and electronic power switch S6 and common DC bus negative pole;
Be series at the electric capacity C3 between the series connection node of electronic power switch S5 and electronic power switch S7 and the series connection node of electronic power switch S6 and electronic power switch S9 and electric capacity C4 successively;
Be connected to the electronic power switch S11 between the series connection node of electronic power switch S7 and electronic power switch S8 and the series connection node of electric capacity C3 and electric capacity C4;
Be connected to the electronic power switch S12 between the series connection node of electronic power switch S9 and electronic power switch S10 and the series connection node of electric capacity C3 and electric capacity C4.
2. seven level inverter circuits according to claim 1, is characterized in that, described electronic power switch S1 ~ electronic power switch S10 is inverse conductivity type turn-off device; Described electronic power switch S11 and described electronic power switch S12 is respectively diode.
3. seven level inverter circuits according to claim 1, is characterized in that, described electronic power switch S1 ~ electronic power switch S12 is inverse conductivity type turn-off device.
4. seven level inverter circuits according to Claims 2 or 3, is characterized in that, described inverse conductivity type turn-off device comprises can turn off power electronic device and diode;
The described power electronic device that turns off comprises emitter and collector electrode; Described emitter is connected with the anode of described diode, and described collector electrode is connected with the negative electrode of described diode;
The described power electronic device that turns off is insulated gate bipolar transistor IGBT, integrated gate commutated thyristor IGCT, IEGT IEGT, bipolar junction transistor BJT or turn-off thyristor GTO.
5. seven level inverter circuits according to claim 1, is characterized in that, described electric capacity C1 is identical with the withstand voltage of described electric capacity C2; Described electric capacity C3 is identical with the withstand voltage of described electric capacity C4; The withstand voltage of described electric capacity C1 is 3 times of the withstand voltage of described electric capacity C3.
6. seven level inverter circuits according to claim 5, is characterized in that, the withstand voltage of described electronic power switch S1 ~ described electronic power switch S4 is identical;
The withstand voltage of described electronic power switch S5 ~ described electronic power switch S12 is identical;
The withstand voltage of described electronic power switch S1 is 3 times of the withstand voltage of described electronic power switch S5.
7. seven level inverter circuits according to claim 6, it is characterized in that, described electronic power switch S1 ~ described electronic power switch S4 includes three sub-electronic power switches of connecting successively, and the withstand voltage of described sub-electronic power switch is identical with the withstand voltage of described electronic power switch S5.
8. a level inverter circuit control method, it is characterized in that, comprise: by being turned on or off of the electronic power switch S1 ~ S12 in preset rules control seven level inverter circuits according to any one of claim 1 to 7, make output stage export seven kinds of different magnitudes of voltage.
9. a polyphase inverter, is characterized in that, comprises multiple seven level inverter circuits according to any one of claim 1 to 7;
Multiple described seven level inverter circuits are in parallel in common DC bus side.
10. a frequency converter, is characterized in that, comprising: rectification circuit and multiple seven level inverter circuits as described in any one of claim 1 to 7;
The input of described rectification circuit is connected with electrical network, and output is connected with common DC bus;
Multiple described seven level inverter circuits are parallel on described common DC bus.
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| CN201410589971.4A CN104333249B (en) | 2014-10-28 | 2014-10-28 | Seven level inverter circuits and control method, polyphase inverter and converter |
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| CN201410589971.4A CN104333249B (en) | 2014-10-28 | 2014-10-28 | Seven level inverter circuits and control method, polyphase inverter and converter |
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| CN104333249B CN104333249B (en) | 2016-08-31 |
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| CN201410589971.4A Expired - Fee Related CN104333249B (en) | 2014-10-28 | 2014-10-28 | Seven level inverter circuits and control method, polyphase inverter and converter |
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| CN106787886A (en) * | 2017-03-23 | 2017-05-31 | 北京交通大学 | Seven level inverse conversion topological structures and seven electrical level inverters |
| CN106849719A (en) * | 2017-04-13 | 2017-06-13 | 北京交通大学 | Seven electrical level inverters and seven level inverse conversion topological structures |
| CN105978376B (en) * | 2016-07-01 | 2018-09-04 | 南方电网科学研究院有限责任公司 | Grid-connected inverter circuit and control method thereof |
| CN109474196A (en) * | 2017-09-07 | 2019-03-15 | 北京德意新能电气有限公司 | Seven level inverse conversion topological structures of one kind and seven electrical level inverters |
| CN112803810A (en) * | 2021-03-01 | 2021-05-14 | 江苏师范大学 | Five-level voltage source type conversion device and control method |
| CN112803812A (en) * | 2021-03-20 | 2021-05-14 | 河北鹏远光电股份有限公司 | Motor train unit power supply and control method thereof |
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